Compression brake for hoisting drums



Sept. 1, 1931.

c. E. KENDRICK ET AL COMPRESSION BRAKE FOR HOISTING DRUMS 2 Sheets-Sheet1 Filed July 143, 1929 Inventors 9 Bymw/h I A ttomey SPt- L1931- C. E.KENDRICK ET AL 1,821,756

COMPRESSION BRAKE FOR HOISTING DRUMS Filed July 15. 1929 2 Sheets-Sheet2 Hime? c Homey Patented Sept.' 1, 1931 l rss PATsr CARL n. KENDRICK ANDBERT w.1vioonn, or LITHIA, FLORIDA; SAID Moons Assrenon 'roV SAIDKENDRICK COMPRESSION BRAKE FOR HOISTIN G DRUMS Application led July 13,

rihe present invention'relates generally to a hoisting drum and has forits prime object to provide a compression brake operatively associatedtherewith. .a Another very important object of the in- Jvention resides'in the combination of a hoisting drum with a piston reciprocablymounted in a cylinder and operatively connected with the hoisting drum,and a valve mechal nism associated with the cylinder to control theintake and exhaust of air therefrom occasioned by the reciprocation ofthe piston so that said means may bemshut off causing a braking actionon the pistons which is effective on the drum to said connecting means.

A still further very important object of the invention resides in theprovision of a mechanism of this nature which is simple in itsconstruction, inexpensive to manufacture, easy te manipulate, compactand convenient, strong and durable, thoroughly ethcient and reliable inuse and operation, and otherwise well adapted to the purpose for whichit is designed.

lVith the above and numerous other objects in view as will appear as thedescription proceeds, the invention resides in certain novel features ofconstruction and in the combination and arrangement of parts as will be3@ hereinafter more fully described and claimed.

1n the drawings: Figure 1 is a side elevation of an apparatus embodying'the features of our invention.

Figure 2 is a top plan view thereof, showing the cylinder` in section,and f Figure 3 is an enlarged detail section taken substantially on theline 3 3 of Figure 1.

Referring to the drawings in detail, it will be seen that the numeral 5denotes a base, with the standard 6 arising therefrom, on which isrotatably mounted a drum 7 hav-- ing driving means 8 associated at oneend thereof and at the other end`being formed with al gear 9. rThe gear9 meshes with the gear 1() on the shaft 11 ournaled in bearings atthe'upper end of the standard 12 rising v from the base 5. A wheel ordisc 14 is fixed to the shaft 11 at the opposite end to the gear 10 andhas an off center pin 15 projecting therefrom with which is engaged aconnect- 1929. Serial N0. 378,098.

ing rod 16. The .numeral 17 denotes the piston cylinder, mounted insupports 18 rising from the base and held in place by straps 19 or inanyY other suitable manner. Heads 20 and 21 are provided at the ends ofthe cylinder. The head 21 is provided with the stuffing box 22 at thecenter thereof through which is slidable a piston 24, reciprocablymounted in the cylinder 17. Pressure actuated safety valves 26 aremounted in the heads 2O and 21. Air intake and outlet pipes 27 lead fromthe ends of the cylinder and have valves 28 provided with valveoperating cranks 29 connected by a control rod 30, so that the valvesmay be opened and closed simultaneously.

From the above detailed description it will be seen that when the valves28 are opened, the piston 24 reciprocates back and forth freely,offeringvery little resistance to the turning of the drum 7, either bythe mechanism 8 or by the load on the cable 7 when wound thereon, butwhen it is desired to brake the drum '.7, it is only necessary to closethe valve 28, and thus a compression brake is formed as the piston tendsto compress the air in the ends of the cylinder and this braking actionis transmitted `to the drum through the rod-s 23 and 16, wheel 14, shaft11 and gearing 9. When compression at either end of the cylinderapproaches a dangerous limit, the valve 26 automatically opens to permitescape of air and consequent reduction of pressure.

It is thought that the construction, operation, utility and advantagesof thisinvention will now be quite apparent to those skilled in this artwithout a more detailed description thereof.

The present embodiment of the inventionhas been disclosed inconsiderable detail merely for the purpose of exemplication, since inactual practice it attains the features of advantage enumerated asdesirable in the statement of the invention and the above description.It will be apparent that changes in the details of construction and inthe combination and arrangement of parts may be resorted to, withoutdeparting from the spirit or scope of the invention as hereinafterclaimed or sacriicing any of its advantages.

What We claim as new s:

A compression brake comprising a cylinder, e piston in said cylinder,adapted to be connected to the member to be brakedi air intakeand outletpipes communicating with the cylinder adjacent opposite limits of thetravel of said piston, L normally open valve ineach pipe, en operatingrod connecting each valve for simultaneously closing Vand opening saineto regulate the escape andentrance of air from and into Said cylinder,and :1V pressure actuated Valve at each end of the cylinder operable toopen the cylinder to the atmosphere when the pressure therein exceeds apredetermined amount.

In testimony whereof We :LHX our signatures.

CARL E. KENDRICK. BERT W.

